Effect of Forging on Microstructure and Properties of 30CrNi2MoV Steel under Low Temperature and Long Time Tempering
Received:July 29, 2017  Revised:September 03, 2017
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KeyWord:30CrNi2MoV;steel, forging;process, microstructure, property
                 
AuthorInstitution
ZhANG Xiao-yu 江苏大学先进制造与现代装备技术工程研究院
XU Xiao-jing 江苏大学先进制造与现代装备技术工程研究院
DU Dong-hui 江苏大学先进制造与现代装备技术工程研究院
TONG Hao 江苏大学先进制造与现代装备技术工程研究院
LIU Zhig-ang 江苏大学先进制造与现代装备技术工程研究院
JU Shi-hao 江苏大学先进制造与现代装备技术工程研究院
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Abstract:
      The effect of forging method on the microstructure and properties of 30CrNi2MoV steel under low temperature tempering and long tempering time was studied by tensile testing machine, impact testing machine, metallographic corrosion test and hardness test. The results show that the tensile strength of 30CrNi2MoV steel after two times upsetting and stretching forging process reaches 1070.1MPa. The tensile strength is increased from 1070.1MPa to 1215.4MPa and 1189.8MPa respectively by the upsetting again based on two times upsetting and stretching forging process or the upsetting and stretching again based on two times upsetting and stretching forging process. Similarly, the impact toughness is improved from 39.67J to 85.33J and 84.67J respectively. To some extent, the hardness has been increased from 375HB to 417.83HB and 393.87HB respectively. The strength of the forging is improved which results from the refinement and uniformity of the grain inside the material. It is found that the strengthening effect of the subsequent forging process on the material is obviously higher than two times upsetting and stretching forging process.
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